open4change.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 15 May 2008 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.41.45 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 185.21.41.45 | 3600s | linux15.curanet.dk | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| google-site-verification=1JGJI1_0k3_jUFdAaRo4Auj9WRCDjOyeewPriUJIdFY |
| protonmail-verification=8cf230920cd974ead5054b9e4345cbd12a6d6f61 |
| v=spf1 mx include:_spf.protonmail.ch include:web.shared.mysmtp.com ~all |
| Policy | Record (open4change.dk) |
|---|---|
| ~all (soft fail) | v=spf1 mx include:_spf.protonmail.ch include:web.shared.mysmtp.com ~all |
| Policy | Record (_dmarc.open4change.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine |
| www | 185.21.41.45 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 7/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026100501 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | CURANET A/S |
| Registered | 2008-05-15 |
| Expires | 2027-05-31 (226d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 09:48:51 | 878ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-07 09:14:53 | 424ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-06 06:55:59 shown | 1104ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 05:31:31 | 451ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-28 14:12:36 | 665ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-24 13:37:33 | 1040ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-23 13:24:58 | 793ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-19 17:58:15 | 1424ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-10 02:56:18 | 853ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-05 18:03:49 | 844ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 21:39:02 | 1224ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-15 08:11:44 | 4506ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-03 03:38:14 | 1359ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-27 17:26:09 | 1243ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-11 01:26:11 | 9358ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-26 02:34:23 | 2255ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 11:51:33 | 1203ms | 2 NS 1 A 2 MX | 🔒 Secure |